A Hybrid Sigma Filter for Unbiased and Edge-Preserving Speckle Reduction (Contributo in atti di convegno)

Type

• Contributo in atti di convegno (Classe)
• Prodotto della ricerca (Classe)

Label

• A Hybrid Sigma Filter for Unbiased and Edge-Preserving Speckle Reduction (Contributo in atti di convegno) (literal)

Anno

• 1995-01-01T00:00:00+01:00 (literal)

Alternative label

• L. Alparone, S. Baronti, A. Garzelli (1995)
  A Hybrid Sigma Filter for Unbiased and Edge-Preserving Speckle Reduction
  in IGARSS 1995, Firenze, 10-14 July, 1995
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• L. Alparone, S. Baronti, A. Garzelli (literal)

Pagina inizio

• 1409 (literal)

Pagina fine

• 1411 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

• http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=00521764 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume

• Geoscience and Remote Sensing Symposium, 1995. IGARSS 1995. IEEE International (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 3 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• IFAC-CNR (literal)

Titolo

• A Hybrid Sigma Filter for Unbiased and Edge-Preserving Speckle Reduction (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn

• 0-7803-2567-2 (literal)

Abstract

• An enhanced version of Lee's sigma filter is derived and proposed for unbiased filtering of images affected by multiplicative noise with speckle statistics. Instead of the plain point value, a more accurate start value is first produced, and then fed to the procedure of conditional average. A robust estimate of the nonstationary mean is defined according to a decision rule borrowed from the FIR-median hybrid filters, thus improving the performance also for impulsive noise. The start value is provided by a nonlinear decision rule aimed at rejecting noise spikes, which is undertaken on the averages computed within four isotropically balanced pixel sets able to capture step edges and thin lines. The level range of pixels to be averaged, adaptively defined as the product of the space- variant mean estimate by the constant noise variance, is also forced to account for the imbalance of the noise distribution, for unbiased processing. Comparison tests performed on images affected by synthetic speckle, simulating both one-look and multi-look statistics, show significant improvements over the basic scheme, as well as over Kuan's and geometric filter, resulting in lower distortion between noise-free and processed images. Also visual comparisons on a true NASNJPL AIRSAR image, establish the superiority of the novel scheme. (literal)

Prodotto di

• Institute of applied physics \"Nello Carrara\" (IFAC) (Istituto)
• Sistemi, metodi di elaborazione ed applicazioni di telerilevamento aerospaziale (ICT.P10.005.001) (Modulo)

Autore CNR

• STEFANO BARONTI (Unità di personale interno)
• LUCIANO ALPARONE (Unità di personale esterno)
• ANDREA GARZELLI (Unità di personale esterno)

Insieme di parole chiave

• Keywords of "A Hybrid Sigma Filter for Unbiased and Edge-Preserving Speckle Reduction" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of applied physics \"Nello Carrara\" (IFAC) (Istituto)
• Sistemi, metodi di elaborazione ed applicazioni di telerilevamento aerospaziale (ICT.P10.005.001) (Modulo)

Autore CNR di

• STEFANO BARONTI (Unità di personale interno)
• LUCIANO ALPARONE (Unità di personale esterno)
• ANDREA GARZELLI (Unità di personale esterno)

Insieme di parole chiave di

• Keywords of "A Hybrid Sigma Filter for Unbiased and Edge-Preserving Speckle Reduction" (Insieme di parole chiave)